Dear Luis,
The requirement that triggered the multiple tabs on workbooks was to be able to see the same simulation in different planning views. To satisfy this requirement, the following convention is in place: All planning views in the same workbook share a simulation. Different workbooks are attached to different simulations.
For that reason, having different versions on the different tabs of a workbook is not useful, as a version is a completely different set of data and cannot show the effects of the simulation you are working on in the other tab.
To have different planning views with different versions, please open those in separate workbooks.
Kind regards,
Cora